Spring compressor



Get. 28, 1924. 1,513,160

E. L. DAHLQUIST sPiuNe COMPRESSOR Filed April 9, 1923 Ernesl L.Dahlquisl.

Patented Get. 28, 1924.

nannsr L. DAHLQUIST, or AUBURN, Iowa.

srnrns ooivirnnsson.

Application filled April 9, 192a. Serial Nop 630,987.

To all whom it may concern: 1

Be it known that I, ERNEST L. DAHL- UIs'r, a citizen of the UnitedStates residing at Auburn, in the county of Sac an'dState of lowa, haveinvented certain new and useful Improvements in Spring Compres-- sors,of which the following is a specification. 1 g i I r w This inventionrelates to tools, and is particularly well adapted for lifting andcompressing the springs of the inlet and exhaust valves of an internal vcombustion engine to allow removal of the valves and stems.

The primary 0b ect of this invention is the provision of a valve springcompressing tool which will automatically look when the spring has beensufliciently compressed and may be unlocked and opened by a very simplemovement and with a, minimum.

amount of force. I 7

A further object of this invention is to provide an improved valvespring com pressing tool of few parts, eliminating the complicatedlocking means yet producing 'a highly efficient too], easy to operateand not susceptible of getting out of order. y

'A still furtherobject of this invention is the provisionof a tool thatis strong, durable, and can undergo the rough usage yet is extremelylight and cheap toymake.

Other objects of the invention will appear in the following detaileddescription taken in connection with the accompanying drill/V1 ing, torninga part of this spec fication, and.

in which drawing:

Figure ,lis a side elevationxof the i nproved valve springcompressingztool show-.

iiig the same in operative relation to, a valve s rin beforebein comressed a fra ment. b .7 b

of an internal combustion engine being shown.

Figure is an end view of the tool in operation on a valve spring withthe tool in a closed position and the spring compressed. V I 1 Figure isa vertical central section through a portion of the tool. 7

Figure at is a crosssection taken on the line 4-4 of Figure 3, lookingin the direction of the arrows.

Figure 5 is a perspective detail view of the spring engaging shanks ofthe tool.

Figure 6 is a perspective detail view of against jaws of one ofthe.

the spring engaging jawsof the other shankof the too-l.

Referring; to the drawings in detail, where-insimilar. referencecharacters designate corresponding parts throughout the several views,the letter A. indicates the internal. combustion engine of the ordinaryor any preferred type and B the valve; 0 is the supporting or main shankmember of the improved-tool; D, theco-acting'shank and E the operatinglever whereby the tool is closed and locked or opened.

The valve B includes the valve stem '7, which is normally held in alowered posi-' tion for holding the. valve on its seatby .thecompression spring 8, which is coiled around stem 7. The cup shapedspring seat 9, providedloosely on stem/Z, is held displacement by meanssuch .asa pinorthe like. Valves-tern 7 israised in the well known mannerby the push rod 10 having the adjusting nuts 11 and 12Tarranged on itsiipperend for the provision of clearance. g j

, Ref rring now'to the main shank member (J, same may be formed ofmetal, preferably U-shaped in cross. section,' having one end anypreferred 7 bifurcated to form fingersll and 14 adapted to engage thework, while the opposite end forms a convenient grip or handle 15. .A.pair of upstanding lu gs 16 and 17 carrying a transverse pin; 18.pivotally support coacting shankD which also, carries a pair ofengaging member-s l9 and 20 at. its end ada c entthe bifurcated endofshankG. These lingers are rigidly mounted onshank D by rivets, oranalogous means 21 and have their engaging @lugs 22, and 23. disposedon, a.

higher planethantheishank D for the purposefof including a arge numberoi spring coils when in operation.

Concerning the operating lever B; such is also preferably made of metalor strong material and issubstantially U-shaped with an elongatedportion to, form ears 24 and 25 by means of which it is [pivotallymounted on shank C by a pintle 26.- Transverse pins 27 may, have an antifriction roller 28 mounted thereon to slide along under sur I face ofshank D when thedevice is operat-- ing. Stop pins, 29 also carried byears 24: and 25 serve as'a limiting element to lock and support lever Ewhen in a completely; opened; or closed position, as shown in Figures 1and '3.

It is to be particularly noticed that the relative distance of pins 26and 27 and 29 away from the pivotal point 18 is of the greatestimportance. In the operation and if: during the closing movement, pin 27reaches or passes dead center and attains a position back of pin 26while pin 29 is still further back of 27 and owing to the expandingtendency of the work 8 shank D is forced open at its engaging end andconsequently closed as in direction toward shank G at its opposite endwhich causes pin 29 to function as a stop or looking member for the jawsof the tool. The dotted position in Figure 1 shows the tool closed orlocked.

Changes in details'may be made, without departing from the spirit orscope of my invention; but,

I claim:

1. A spring compressor comprising in combination a supporting shanksubstantially U-shaped in cross section, a pair of up standing earscarried thereby, a co-acting shank pivotally disposed between said earsf the supporting shank, spring engaging jaws carried on the adjacentends of the shanks, and an actuating and a locking shanks and having itsarms pivotally connected to one of said shanks, a guide carried by thearms and extending between the shanks to engage the inner face of oneshank, and a locking pin carried by the arms beneath the guide andadapted to engage the inner face of the other shank and limit movementof the lever.

3. In a spring compressor, the combination of a pair of coacting shanksdisposed in pivoted relation to each other, an operating and lockingmeans comprising a lever with projecting sides extended at one end tostraddle both shanks and pivotally carried by one of them, a transversebearing roller and stop pin carried intermediate the wanting shanks, thestop pin being so situated between the pivotal point and said bearingroller that the expanding tendency of the work forces said operatinglever into a locked position.

a. In a spring compressor, a pair of shanks pivotally connected at apoint intermediate their lengths to provide forwardly and rearwardlyextending portions, one of said shanks having its forwardly extendingportion provided with means for engaging and supporting a springsupporting cup,

arms carried by the forwardly extending portion of the second shank andcurved outwardly to extend upon opposite sides of a spring, lugsextending upwardly from the endportions of said arms and having inturnedend portions for engaging convolu-v tions of a spring at opposite sidesof the spring, and actuating means cooperating with therearwardlyextending portions of said shanks.

5. In a spring compressor, a pair of shanks movable towards and awayfrom each other, spring cup engaging means carried by one shank, armscarried by the. other shank and shaped to extend in straddling relationto a spring, and lugs extending 'up wardly from said arms and havinginwardly extending portions for engaging convolutions of the spring, atopposite sides of the spring. i I

6. A spring compressor including members movable towards and away fromeach other, spring cup engaging means carried byone ofsaid members,vandarms carried by the other member for straddling a spring and having lugsextending inwardly of the arms for engaging convolutions of the springat opposite sides of the spring.

ERNEST L. DAHLQUIST.

